Idk this may be a repeat. I'm seeing all manner of posts about red lights, motors not spooling up, and not a smart battery. This can all be caused by the TERRIBLE design of the battery fit. It gets voltage but the other two small contacts don't connect. You must pound the battery in. I have to remove the battery cover and pull the battery with channel locks. I would leave the cover off but this disables the start stop button. Hope this helps.